avformat/mpc8: fix broken pointer math

This could overflow and crash at least on 32 bit systems.
Reviewed-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit b737a2c5)

Conflicts:

	libavformat/mpc8.c
(cherry picked from commit 49dd89f9

)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/mpc8.c

@@ -88,7 +88,7 @@ static int mpc8_probe(AVProbeData *p)
         size = bs_get_v(&bs);
         if (size < 2)
             return 0;
-        if (bs + size - 2 >= bs_end)
+        if (size >= bs_end - bs + 2)
             return AVPROBE_SCORE_MAX / 4 - 1; //seems to be valid MPC but no header yet
         if (header_found) {
             if (size < 11 || size > 28)